Shift Drive instead utilizes a rear cog that incorporates several separate sprocket-toothed elements arranged side-by-side to form a ring. Each element can independently swivel 180 degrees relative to ...

Last July, when Greg Martin rolled across the finish line to win the 2009 Singlespeed World Championships bike race in Canmore, Alberta, one thing was missing from the rig he'd pedaled for 24 hours ...

Over-tensioning shortens not only the life of V-belts but also that of the sheaves, electric motor, and driven equipment bearings. In extreme cases, it can even bend or break a motor shaft.